Phenylhydrazine and its van der Waals complexes with one or two argon atoms were investigated with theoretical calculations and resonant two photon ionization (R2PI) spectroscopy. The ab initio and DFT calculations found a conversion of the orbital hybridization of the N(beta) atom from sp(3)-like in the S(0) state to sp(2)-like in the S(1) state, suggesting that the lone pair electrons of the N(beta) atom are involved in a super p-p-pi conjugation over the skeleton of phenylhydrazine in the S(1) state. The structural change of the hydrazino group in the S(1)